Add a tool to track down fd leaks.
Add a hook that's called upon file descriptor creation to libc, and a
library that uses it to capture backtraces for file descriptor creation,
to make it easier to hunt down file descriptor leaks.
Currently, this doesn't capture all of the ways of creating a file
descriptor, but completeness isn't required for this to be useful as
long as leaked file descriptors are created with a function that is
tracked. The primary unhandled case is binder, which receives file
descriptors as a payload in a not-trivially-parsable byte blob, but
there's a chance that the leak we're currently trying to track down
isn't of a file descriptor received over binder, so leave that for
later.
Bug: http://b/140703823
Test: manual
Change-Id: I308a14c2e234cdba4207157b634ab6b8bc539dd9
(cherry picked from commit b7eccd4b1577c101132e52d4a5313d5322dcae2d)
diff --git a/libc/private/bionic_tls.h b/libc/private/bionic_tls.h
index bb5c67b..80d645a 100644
--- a/libc/private/bionic_tls.h
+++ b/libc/private/bionic_tls.h
@@ -128,6 +128,9 @@
group_state_t group;
passwd_state_t passwd;
+ char fdtrack_disabled;
+ char padding[3];
+
// Initialize the main thread's final object using its bootstrap object.
void copy_from_bootstrap(const bionic_tls* boot __attribute__((unused))) {
// Nothing in bionic_tls needs to be preserved in the transition to the